6br dasher=unbelievable performance!

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I am building a 6.5 twist 22 cal for 1000 yard shooting to shoot wildcats 100 grain bullets. I am between the 22 br the 22 brx and 22 dasher. Seeing the performance of your 6 dasher do you think the brx case will give you close to the same speed. Where did you get dies or did you make them. I was going to use a 28 inch barrel. I heard the brx and the dasher give close to the same performance, the slight edge going to the dasher. any input would be helpful good shooting nice gun

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Reed--missed you at the lewistown match last time!!

Click the link in my sig line and look at last week's Gun OF THe Week -- twas an AMAZING 22-dasher [img]/ubbthreads/images/graemlins/wink.gif[/img]

I must say that it is mostly the effect of such a great design that yields such low sd's, but I will share the case prep that went into my brass.

First, I bought 100 pieces of Lapua brass. After that, I ran them all over a .001" oversized neck mandrel. Then trimmed them all to same length. Then I squared the case heads. Then I turned the necks for a .265" neck and uniformed the primer pockets and deburred the flash holes. Contrary to popular belief, the flash holes on this brass were not perfect. WHile there was no outstanding burrs, they had a flat side on some that would have affected ignition. I also like to put a slight bevel on the flash hole because I believe it helps "funnel" the flash through to touch a wider base of the powder column.

Anyway, after all this was done, I weighed them and found no more than .4 of a grain variation in all 100 pieces!

After that, I just trickled in the exact amount of Varget and RL15 and seated the 105 AMAX into the jam and went shooting.

On a side note, I chose the AMAX because of it's better explosion on varmints over the Sierra's or Bergers and I managed to test the expansion factor on a crow yesterday and the results were, well, gory!

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Is there a difference between the 6BR Imp and the 6Dasher"?

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There are many versions of the improved, but the Dasher and the main improved reamer are the same. My gunsmith actually built a reamer for the 6 and 7 br imp 10 years before Dowling got credit for it, and he calls it a 6 br tejas.

What I was getting at was that it IS NOT a hotter primer in my experience as it gave almost exact same velocities as the Federal 205gm in every charge tried (which was 6 different charges). And it truly did give low sd's, but so did the Win wsr and Fed 205gm's. In fact, each primer at one point or another gave an sd of 1 foot per second.

THe brx is kindof a poor mans version of the dasher if you are going to look at it from a tooling point of view. I guess it costs more to make a reamer for the dasher, but it couldn't be too much more. A few bucks maybe. And regular br dies can be used to load the BRX, whereas you must get dasher dies for the dasher.

I personally would still go with the dasher for your project. I believe, no scratch that, <font color="blue"> I KNOW </font> that the shaper shoulder burns the slower burning powders more efficiently for an increase of performance with the heavier bullets which is what you will be shooting.
A great example of this is my two 22-250 improved's. One is a 14 twist for 55 grain bullets, and the other is an 8 twist for the 80 grain bullets. The slow twist shoots 55's about 200 feet per second more than a standard 22-250, but the improved fast twist shoots 80 grainers up to 400 fps faster than the standard case can get!
THis is the whole reason why PO ackley designed his famous alteration, to utilize all the slow burning mil-surplus 4831 that was around at the time. And I say it works! [img]/ubbthreads/images/graemlins/grin.gif[/img]

That 22 dasher that was on 6mmbr.com last week was super efficient. It was burning about 6 grains less powder than my 22-250 imp and was getting the same velocity with only a 1 inch longer barrel! Of course, the owner stated clearly that that load would probably not work in any other rifle without blowing it up!

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Where did you get dies or did you make them.

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I bought a Redding comp bushing neck die and a comp seater for the standard br and two seperate sleeves. My gunsmith then reamed the extra sleeves for the improved with the same reamer that made the chamber. With that, I can load for my standard br or my improved br and all I have to do is insert the correct sleeve. It is a very slick setup. All I had to have made was a body die for the improved, and that is also being handled by Redding.